what do you use for wrist pin retainers?

[der affe]

so i am gathering parts/machining stuff formy engine build and i thought of something. for those who have built their own HI PERF. motors, what do you use for wrist pin retainers? stock? reuse the stock ones? buy new stock ones if you can? have the pistons machined for internal snap rings? teflon buttons?

i am building a 2.7i with a lightened knife edged crank, lightened polished rods, balabced early euro eta 11.2:1 pistons, lightened flywheel , P&P 885 head. 292 cam, dibilas, ie rockers, crank scraper, MS, ebay long tubes, no cat. once i get it broken in and sorted i will be adding a the m-90 s/c and intercooler. once the s/c is added the motor should not see more than 7k rpm because that will be over driving the s/c.

with this set up should i even be concerned about the wrist pin retainers? not enough crank flex/side loading to worry about it? if not stock then what do you guys use?

thanks

[Naplm00]

ive built a few hi strung aircooled vws; always with either snaprings or button depending on the piston cyl kit

[der affe]

in aircooled i have always either gone teflon buttons or double snap rings. there is a lot more of an issue with crank flex and sideloading of the piston in those being they are a horizontally opposed motor where as an m-20 is inline.

maybe i am over thinking it and there wont be an issue with these motors, but i want to cover all the bases so i don't have an opps later.

i also don't know if they make teflon buttons for these motors, but they are easy enough to make if need be.

[mrsleeve]

just get a new set of snap rings

[der affe]

will a regular internal snap ring drop in or do i need to have them machined to accept one?
stock is a circlip

[e30esque]

11.2 cr and a blower??? are you going to be running a J&S safeguard, or does MS have the ability to retard for knock?

[Danny]

Ms is more than capable of running a knock sensor.

[der affe]

actually with the 885 head, it will drop the compression down to 10.2:1. perfictly fine for 10-12 psi MAX with an intercooler. i should not need a knock sensor then with the MS.

[mrsleeve]

I would still run a knock sensor on anything, especially a boosted Mill.

[e30esque]

I would still run a knock sensor on anything, especially a boosted Mill.

Man speaks the truth. Protect your investment.

[nando]

I would use new stock clips. don't reuse old ones. they're cheap too.

Ms is more than capable of running a knock sensor.

sure, but it's not neccesary at all - it's a safety net, not a tuning tool, and your ignition should be tuned on a dyno anyway (especially if you are boosted). Unless you're running way past MBT, running shit gas, or trying to tune by ear. The whole knock sensor "issue" is mostly played up by people who don't know better.

repeat after me - knock sensors are not used for tuning. knock sensors are not used for tuning. knock sensors are not used for tuning.

[blueapplesoda]

then repeat some more- knock sensors are not used for tuning. knock sensors are not used for tuning. knock sensors are not used for tuning.

btw i used wrist pin locks that looked similar to stock ones with my wiseco pistons, little wire circlip ring thing. forgot what its called, but they are a bitch to get out.